Sludge Dewatering System

Sludge Dewatering Systems are a critical component of wastewater treatment and industrial effluent management. After biological or chemical treatment, sludge typically contains 60–90% water, making it bulky and costly to handle. Dewatering reduces the water content, resulting in:

  • ✔ Reduced sludge volume: Up to 70% reduction
  • ✔ Lower transport and disposal costs
  • ✔ Improved reusability: Compost, biofuel, construction material
  • ✔ Eco-compliant: Meets environmental disposal standards
Sludge Dewatering System

1. Multidisc Dewatering System

The Multidisc Screwpress Dewatering System is a next-generation technology designed to minimize water and power usage. It operates using a series of fixed and moving discs that filter sludge while a screw mechanism continuously moves the sludge forward. The gaps between discs remain self-cleaning, preventing clogging — a common issue in conventional belt presses.

  • ✔ Energy-Efficient: Operates at <0.1 kW/h per kg DS
  • ✔ Minimal Water Usage: Requires very little wash water
  • ✔ Low Maintenance: Slow-moving parts reduce wear
  • ✔ Compact & Silent: Small footprint, quiet operation
  • ✔ Handles Difficult Sludge: Oily, fibrous, concentrated sludge

Applications:

  • ✔ Municipal sewage treatment plants (STPs)
  • ✔ Small to medium industrial ETPs
  • ✔ Food & beverage processing industries
  • ✔ Textile & chemical industries with oily sludge
Multidisc Dewatering

2. Screwpress Dewatering System

The Screwpress is a continuous dewatering equipment where sludge is fed into a cylindrical filter screen. A slow-rotating screw shaft applies pressure, gradually squeezing out water. The system works under low pressure but extended time, ensuring effective dewatering with minimal noise and vibration.

  • ✔ Consistent Dry Cake: 15–25% dry solids
  • ✔ Energy Saving: Lower energy use than centrifuges
  • ✔ Robust Performance: Can run 24/7
  • ✔ Automatic Control: PLC/SCADA integration possible
  • ✔ Self-Cleaning Filter Gaps: Reduces clogging risks

Applications:

  • ✔ Industrial wastewater plants (pulp & paper, tanneries, pharma, steel, etc.)
  • ✔ Large municipal STPs/ETPs
  • ✔ Continuous sludge treatment plants
  • ✔ Sludge with high organic content
Screw Press Dewatering

3. Basket Centrifuge

A Basket Centrifuge operates at high rotational speeds (1000–4000 rpm), generating centrifugal forces up to 3000× gravity. This rapidly separates water from sludge, producing a very dry cake. However, the system demands higher power and skilled operation.

  • ✔ Fast Processing: Dewaters sludge within minutes
  • ✔ Very High Dryness: 30–40% dry solids
  • ✔ Durable Build: Suitable for abrasive sludge
  • ✔ Batch & Continuous Models: Flexible operation

Limitations:

  • ✔ Higher energy demand
  • ✔ Frequent maintenance required
  • ✔ Requires skilled operator

Applications:

  • ✔ Chemical & pharmaceutical manufacturing
  • ✔ Mining and metallurgical industries
  • ✔ High-solid concentration sludge treatment
  • ✔ Large ETPs needing maximum dryness quickly
Basket Centrifuge

Comparison at a Glance

System Type Energy Use Dryness Level Maintenance Best For
Multidisc Dewatering Very Low Medium (15–20%) Very Low Compact plants, oily/fibrous sludge
Screwpress Dewatering Low Medium–High (15–25%) Low Continuous industrial STP/ETP
Basket Centrifuge High Very High (30–40%) Moderate–High Heavy-duty, high-volume sludge
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